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Class 10 Magnetic effects of current - Short questions



1) What is a solenoid?
2) What kind of magnetic field is produced by a current carrying solenoid?
3) Why does a compass needle show deflection when brought near a bar magnet?
4) Why are magnetic field lines more crowded towards the pole of a magnet?
5) What are magnetic field lines?
6) Draw a diagram to represent a uniform magnetic field in a given region.
7) For same current flowing through a solenoid and a straight conductor, the magnetic field produced by a solenoid is much stronger than the magnetic field produced by a straight current carrying conductor. State one reason to justify this statement.
8) Why does a current carrying conductor experience a force when it is placed in a magnetic field?
9) Whenever there is a relative motion between  magnet and a coil, a current is induced in the coil. Name this phenomenon.
10) How is the type of current that we receive in domestic circuit different from the one tht runs a clock?
11) What type of current is given direct current?
12) What type of current is used in household supply?
13) Why do we connect earth wire in a house? Give two reasons.
14) What is the difference between a direct current and an alternating current. How many times does AC used in India change direction in one second?
15) What is the role of fuse used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?
16) A magnetic compass shows a deflection when placed near a current – carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? Support your answer with a reason.
17) Explain why does a compass needle get deflected when brought near a bar magnet.
18) Why can’t two magnetic field lines cross (intersect) each other?
19) Compare the pattern of the magnetic field around a solenoid with the magnetic field around a bar magnet.
20) A compass needle is placed near a current – carrying wire. State your observation for the following cases and give reason for the same in each case:
(i) Magnitude of electric current in the wires increased.
(ii) The compass needle is displaced away from the wire.
21) State the rule for finding the direction of the magnetic field produced around a current carrying conductor.
22) Mention the shape of the magnetic field lines around a current carrying straight conductor.
23) A current carrying conductor in a magnetic field experiences a fore. Write the condition for this force to be maximum.
24) Name and state the rule that helps to find the force on a current carrying conductor in a magnetic field.
25) An alternating electric current has a frequency of 50 Hz. How many times does it changes its direction in one second? Give reason for your answer.
26) Explain why electrical appliances are connected in parallel in household circuits.
27)  Draw the pattern of magnetic field lines of a solenoid through which a steady current flows.
28) A coil of insulated wire is connected to a galvanometer. What would beseen if a bar magnet with its south pole towards one face of the coil is:
(a) Moved quickly towards it?
(b) Moved quickly away from it?
(c) Placed near its once face?
(d) Name the phenomena involved.
29) What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?
30) Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in coil B? Give reason.

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